US4809310A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Device for supplying current to a filament of an x-ray tube
Assignee: General Electric CGR SA
•
Filing: 1987-04-08
•
Granted: 1989-02-28
•
Expires: 2007-04-08
Abstract
Abstract The invention pertains to a current-supplying device used to supply heating current to a filment of an X-ray tube. The current-supplying device comprises a current inverter delivering current to a load circuit in which there is an oscillating circuit, the impedance of which is made to vary.
Inventors
- 👤 Jacques Salesses
- 👤 Arthur Baghdiguian
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 21:22
CPC Classifications
H; H05; H05G; H05G1/00; H05G1/08; H05G1/26; H05G1/30; H05G1/34; H05G1/10; H05G1/20
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
175 words
A device for supplying current to a filament of at least one X-ray tube, said device comprising: a generator means for providing control pulses; a current inverter for receiving said controlled pulses and outputting an alternating heating current from a direct voltage, a regulator circuit for regulating said heating current according to a set value; a load circuit for receiving said alternating heating current wherein said load circuit comprises an oscillating circuit and a primary winding of a transformer wherein said heating current is applied through said transformer to said filament of said at least one X-ray tube and wherein said heating current has the same frequency as the frequency of said control pulses; wherein said oscillating circuit is connected in series with said primary winding; wherein said regulator circuit includes a means for outputting an error signal which is applied to said generator in order to modify the frequency of said control pulses to thereby modify the impedance of said oscillating circuit until the value of said heating current corresponds to said set value.
Claim 2
Independent Claim
175 words
A device for supplying current to a filament of at least one X-ray tube, said device comprising: a generator means for providing control pulses; a current inverter for receiving said controlled pulses and outputting an alternating heating current from a direct voltage, a regulator circuit for regulating said heating current according to a set value; a load circuit for receiving said alternating heating current wherein said load circuit comprises an oscillating circuit and a primary winding of a transformer wherein said heating current is applied through said transformer to said filament of said at least one X-ray tube and wherein said heating current has the same frequency as the frequency of said control pulses; wherein said oscillating circuit is connected in series with said primary winding; wherein said regulator circuit includes a means for outputting an error signal which is applied to said generator in order to modify the frequency of said control pulses to thereby modify the impedance of said oscillating circuit until the value of said heating current corresponds to said set value.
Claim 3
Independent Claim
221 words
A device for supplying current to a filament of at least one X-ray tube, said device comprising: a generator means for providing control pulses; a current inverter for receiving said controlled pulses and outputting an alternating heating current from a direct voltage comprising between the direct voltage poles, firstly, at least two electronic switches in series and, secondly, two capacitors in series, a first end of the load circuit being linked to junction of the two electronic switches, the other end of the load circuit being linked to a junction of the two capacitors; a regulator circuit for regulating said heating current according to a set value; a load circuit for receiving said alternating heating current wherein said load circuit comprises a primary winding of a transformer wherein said heating current is applied through said transformer to said filament of said at least one X-ray tube and wherein said heating current has the same frequency as the frequency of said control pulses; an oscillating circuit means connected to said load circuit; wherein said regulator circuit includes a means for outputting an error signal which is applied to said generator in order to modify the frequency of said control pulses to thereby modify the impedance of said oscillating circuit means until the value of said heating current corresponds to said set value.
Claim 4
Independent Claim
221 words
A device for supplying current to a filament of at least one X-ray tube, said device comprising: a generator means for providing control pulses; a current inverter for receiving said controlled pulses and outputting an alternating heating current from a direct voltage comprising between the direct voltage poles, firstly, at least two electronic switches in series and, secondly, two capacitors in series, a first end of the load circuit being linked to junction of the two electronic switches, the other end of the load circuit being linked to a junction of the two capacitors; a regulator circuit for regulating said heating current according to a set value; a load circuit for receiving said alternating heating current wherein said load circuit comprises a primary winding of a transformer wherein said heating current is applied through said transformer to said filament of said at least one X-ray tube and wherein said heating current has the same frequency as the frequency of said control pulses; an oscillating circuit means connected to said load circuit; wherein said regulator circuit includes a means for outputting an error signal which is applied to said generator in order to modify the frequency of said control pulses to thereby modify the impedance of said oscillating circuit means until the value of said heating current corresponds to said set value.
Claim 5
Dependent Claim
21 words
Current-supplying device according to the claim 2, wherein the regulation circuit means comprises a current sensor connected to said load circuit.
Claim 6
Dependent Claim
19 words
Current-supplying device according to the claim 2, wherein the two capacitors constitute the capacitance of the oscillating circuit means.
Claim 7
Dependent Claim
15 words
Current-supplying device according to the claim 2, wherein the two electronic switches are field-effect transistors.
Claim 8
Dependent Claim
21 words
Current-supplying device according to the claim 2, wherein the oscillating circuit means comprises a capacitance in series with an inductive resistor.
Claim 9
Dependent Claim
24 words
Current-supplying device according to the claim 2, wherein the oscillating circuit means has a resonance frequency below a frequency F of the control pulses.
Claim 10
Dependent Claim
18 words
Current-supplying device according to the claim 2, wherein the two capacitors form a decoupling of the load circuit.
Claim 11
Dependent Claim
33 words
Current-supplying device according to any one of claims 3-14 8 and 1, comprising a switching-over device used to select an X-ray tube, the filament of which is to be supplied with heating current.
References Cited (Backward Citations)
US3567995A
Cited
US3916251A
Cited
DE2826455A1
Cited
GB2005878A
Cited
FR2471118A1
Cited
WO1982000397A1
Cited
EP0075283A1
Cited
EP0137401A2
Cited
US4573184A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-02-28 | 1992-08-29 | 1993-02-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-02-28 | 1996-08-29 | 1997-02-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-02-28 | 2000-08-29 | 2001-02-28 | $7700.00 | Window Closed / Lapsed |